Tru-Flate's Dual Foot, Locking Air Chuck features a straight-on head and chrome plated, all metal construction - built to withstand the toughest home garage or shop use. Straight-on head features a threaded, deep well lock that holds chuck securely in place when tilted. Not for use with inflator gauges - chuck has it's own shut-off valve and will not work with inflator gauges which are intended to regulate the air flow. 1/4-18 female NPT inlet thread. Tru-Flate is part of the Plews & Edelmann group. Plews & Edelmann is a leading designer, manufacturer and distributor of a broad range of automotive parts and tools sold to the vast majority of mass merchant, retail auto parts stores and wholesale automotive parts and industrial distribution outlets, worldwide.